Hi Ernest;
Wiki says …
Quote:
The gravitational constant is perhaps the most difficult physical constant to measure to high accuracy. In SI units, the 2006 CODATA-recommended value of the gravitational constant is:
G=6.67428 x 10^-11 N(m/kg)^2
with relative standard uncertainty 1 part in 10^4.
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That makes it uncertain to only 0.01%, doesn't it ?
Cheers